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Convex Shape and Rotation Model of Lucy Target (11351) Leucus from Lightcurves and Occultations

Mottola, Stefano and Hellmich, Stephan and Buie, Marc W. and Zangari, Amanda M. and Marchi, Simone and Brown, Michael E. and Levison, Harold F. (2020) Convex Shape and Rotation Model of Lucy Target (11351) Leucus from Lightcurves and Occultations. Planetary Science Journal, 1 (3). Art. No. 73. ISSN 2632-3338. doi:10.3847/psj/abb942.

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We report new photometric lightcurve observations of the Lucy Mission target (11351) Leucus acquired during the 2017, 2018, and 2019 apparitions. We use these data in combination with stellar occultations captured during five epochs to determine the sidereal rotation period, the spin axis orientation, a convex shape model, the absolute scale of the object, its geometric albedo, and a model of the photometric properties of the target. We find that Leucus is a prograde rotator with a spin axis located within a sky-projected radius of 3° (1σ) from J2000 Ecliptic coordinates (λ = 208°, β = +77°) or J2000 Equatorial Coordinates (R.A. = 248°, decl. = +58°). The sidereal period is refined to P_(sid) = 445.683 ± 0.007 h. The convex shape model is irregular, with maximum dimensions of 60.8, 39.1, and 27.8 km. The convex model accounts for global features of the occultation silhouettes, although minor deviations suggest that local and global concavities are present. We determine a geometric albedo of p_V = 0.043 ± 0.002. The derived phase curve supports a D-type classification for Leucus.

Item Type:Article
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URLURL TypeDescription Paper
Mottola, Stefano0000-0002-0457-3872
Buie, Marc W.0000-0003-0854-745X
Brown, Michael E.0000-0002-8255-0545
Additional Information:© 2020 The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2020 July 6; revised 2020 September 1; accepted 2020 September 15; published 2020 December 8. Research at the DLR was funded by the DLR Programmatik Raumfahrtforschung und -technologie through the grant 2474029 Lucy. Part of this work was supported by the Lucy Mission which is funded through the NASA Discovery program on contract number NNM16AA08C. This work was partly based on observations collected at the Centro Astronómico Hispano-Alemán (CAHA) at Calar Alto.
Funding AgencyGrant Number
Deutsches Zentrum für Luft- und Raumfahrt (DLR)2474029 Lucy
Subject Keywords:Light curves ; Stellar occultation ; Jupiter trojans ; CCD photometry
Issue or Number:3
Classification Code:Unified Astronomy Thesaurus concepts: Light curves (918); Stellar occultation (2135); Jupiter trojans (874); CCD photometry (208)
Record Number:CaltechAUTHORS:20201214-122213110
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Official Citation:Stefano Mottola et al 2020 Planet. Sci. J. 1 73
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107069
Deposited By: Tony Diaz
Deposited On:14 Dec 2020 20:32
Last Modified:16 Nov 2021 18:59

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